PHP array_mulitsort

1.函数的作用：对多维数组进行排序

2.函数的例子：

例子一：

 <?php
 // http://php.net/manual/zh/function.array-multisort.php
 $multiArray = Array(
     Array("id" => 1, "name" => "Defg"),
     Array("id" => 2, "name" => "Abcd"),
     Array("id" => 3, "name" => "Bcde"),
     Array("id" => 4, "name" => "Cdef"));
 $tmp = Array();
 foreach($multiArray as &$ma)
     $tmp[] = &$ma["name"];
 array_multisort($tmp, $multiArray);
 foreach($multiArray as &$ma)
     echo $ma["name"]."<br/>";

 /* Outputs
     Abcd
     Bcde
     Cdef
     Defg
 */ 

 <?php
 // http://php.net/manual/zh/function.array-multisort.php
 $multiArray = Array(
     Array("id" => 1, "name" => "Defg"),
     Array("id" => 2, "name" => "Abcd"),
     Array("id" => 3, "name" => "Bcde"),
     Array("id" => 4, "name" => "Cdef"));
 $tmp = Array();
 foreach($multiArray as &$ma)
     $tmp[] = &$ma["name"];
 array_multisort($tmp, $multiArray);
 foreach($multiArray as &$ma)
     echo $ma["name"]."<br/>";

 /* Outputs
     Abcd
     Bcde
     Cdef
     Defg
 */ 

例子二：

 // http://php.net/manual/zh/function.array-multisort.php
 function array_msort($array, $cols)
 {
     $colarr = array();
     foreach ($cols as $col => $order) {
         $colarr[$col] = array();
         foreach ($array as $k => $row) { $colarr[$col]['_'.$k] = strtolower($row[$col]); }
     }
     $eval = 'array_multisort(';
     foreach ($cols as $col => $order) {
         $eval .= '$colarr[\''.$col.'\'],'.$order.',';
     }
     $eval = substr($eval,0,-1).');';
     eval($eval);
     $ret = array();
     foreach ($colarr as $col => $arr) {
         foreach ($arr as $k => $v) {
             $k = substr($k,1);
             if (!isset($ret[$k])) $ret[$k] = $array[$k];
             $ret[$k][$col] = $array[$k][$col];
         }
     }
     return $ret;

 }